Chapter 6.3. Selecting LUN attributes for MDisks
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Chapter 6. MDisks 87 6.2.2 FlashCopy I/ O The transfer size for FlashCopy is always 256 KB, because the grain size of flashcopy is 256 KB and any size write that changes data within a 256 KB grain will result in a single 256 KB write. 6.2.3 Coalescing writes The SVC will coalesce writes up to the 32 KB track size if writes reside in the same tracks prior to destage. For example, if 4 KB is written into a track, then another 4 KB is written to another location in the same track, this track will move to the top of the least recently used ( LRU) list in the cache upon the second write, and the track will now contain 8 KB of actual data. This can continue until the track reaches the bottom of ...
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